1=pod 2 3=head1 NAME 4 5SSL_CTX_set_min_proto_version, SSL_CTX_set_max_proto_version, 6SSL_CTX_get_min_proto_version, SSL_CTX_get_max_proto_version, 7SSL_set_min_proto_version, SSL_set_max_proto_version, 8SSL_get_min_proto_version, SSL_get_max_proto_version - Get and set minimum 9and maximum supported protocol version 10 11=head1 SYNOPSIS 12 13 #include <openssl/ssl.h> 14 15 int SSL_CTX_set_min_proto_version(SSL_CTX *ctx, int version); 16 int SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version); 17 int SSL_CTX_get_min_proto_version(SSL_CTX *ctx); 18 int SSL_CTX_get_max_proto_version(SSL_CTX *ctx); 19 20 int SSL_set_min_proto_version(SSL *ssl, int version); 21 int SSL_set_max_proto_version(SSL *ssl, int version); 22 int SSL_get_min_proto_version(SSL *ssl); 23 int SSL_get_max_proto_version(SSL *ssl); 24 25=head1 DESCRIPTION 26 27The functions get or set the minimum and maximum supported protocol versions 28for the B<ctx> or B<ssl>. 29This works in combination with the options set via 30L<SSL_CTX_set_options(3)> that also make it possible to disable 31specific protocol versions. 32Use these functions instead of disabling specific protocol versions. 33 34Setting the minimum or maximum version to 0, will enable protocol 35versions down to the lowest version, or up to the highest version 36supported by the library, respectively. 37 38Getters return 0 in case B<ctx> or B<ssl> have been configured to 39automatically use the lowest or highest version supported by the library. 40 41Currently supported versions are B<SSL3_VERSION>, B<TLS1_VERSION>, 42B<TLS1_1_VERSION>, B<TLS1_2_VERSION>, B<TLS1_3_VERSION> for TLS and 43B<DTLS1_VERSION>, B<DTLS1_2_VERSION> for DTLS. 44 45=head1 RETURN VALUES 46 47These setter functions return 1 on success and 0 on failure. The getter 48functions return the configured version or 0 for auto-configuration of 49lowest or highest protocol, respectively. 50 51=head1 NOTES 52 53All these functions are implemented using macros. 54 55=head1 SEE ALSO 56 57L<ssl(7)>, 58L<SSL_CTX_set_options(3)>, L<SSL_CONF_cmd(3)> 59 60=head1 HISTORY 61 62The setter functions were added in OpenSSL 1.1.0. The getter functions 63were added in OpenSSL 1.1.1. 64 65=head1 COPYRIGHT 66 67Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved. 68 69Licensed under the Apache License 2.0 (the "License"). You may not use 70this file except in compliance with the License. You can obtain a copy 71in the file LICENSE in the source distribution or at 72L<https://www.openssl.org/source/license.html>. 73 74=cut 75